WYG’s task in this project was to assist the Integrated Territorial Investment (ITI) unit of Croatia’s Ministry of Regional Development and EU Funds (MRDEUF) in implementing the ERDF’s Sustainable Urban Development regulation. More than twenty WYG staff provided a wide range of services as assistance to the ITI units, including a comprehensive assessment of the existing organisational framework for European Structural and Investment Funds, providing assistance in preparing project documentation, capacity building, and knowledge sharing to ITI Intermediate Bodies in seven Croatian cities. We also organised seven workshops on ERDF-ESF project integration in all seven cities, supported MRDEUF in selecting and developing strategic projects, organised two international field visits, and designed promotional materials to ensure the ITI mechanism’s visibility and continued implementation in Croatia.